Pop-up stopper for a 2" drain Ell

[Mike_Campbell]

I have an older Kohler tub with a 2" Drain Elbow # 43096 and would like to convert the mechanical lever stopper to a pop-up stopper. I can only find 1.5" replacement pop-ups. Does anyone know of a source for a pop-up stopper that will fit the Kohler 2" drain ell? Also maybe a threaded adapter sleeve that reduces the ell to a 1.5" ? Looking for any answers that will not require me to cut into the wall. Thanks in advance.
Mike in Montana